FFR sensor head design that minimizes stress induced pressure offsets

Patent metadata

Field	Value
Publication number	US-11076765-B2
Application number	US-201414341374-A
Country	US
Kind code	B2
Filing date	Jul 25, 2014
Priority date	Jul 26, 2013
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A pressure sensing medical device may include a guidewire including a tubular member having a lumen, the tubular member being translatable between a generally straightened position and a deflected position, and a pressure sensor attached at a distal end of a fiber optic extending within the lumen, the pressure sensor being disposed within a distal portion of the tubular member. The pressure sensor may include a pressure-sensitive membrane disposed on a distal end thereof. The pressure sensor may include one or more contact members capable of providing a contact point between the contact member and an inner surface of the tubular member when in the deflected position, the contact point being axially spaced apart from the membrane along a longitudinal axis of the pressure sensor.

First claim

What is claimed is:

1. A pressure sensing medical device, comprising:
a guidewire including an elongate tubular member having a lumen extending therethrough; and
an optical pressure sensor attached at a distal end of a fiber optic extending longitudinally within the lumen, the pressure sensor being disposed within a distal portion of the tubular member;
wherein the pressure sensor includes a sensor head having an outer surface, a distal end, and a proximal end disposed adjacent to the distal end of the fiber optic;
wherein the pressure sensor further includes a contact member attached to the outer surface of the sensor head at a position between the proximal end and the distal end of the sensor head, the contact member being capable of providing one or more distinct contact points between the contact member and an inner surface of the tubular member, the one or more distinct contact points being axially spaced apart from a distal end of the pressure sensor.

2. The pressure sensing medical device of claim 1 , including at least one attachment member fixedly attaching the fiber optic to the tubular member within the distal portion, the at least one attachment member being proximally spaced apart from the pressure sensor.

3. The pressure sensing medical device of claim 1 , wherein the contact member is spaced apart from the inner surface of the tubular member in a generally straightened position.

4. The pressure sensing medical device of claim 1 , wherein the contact member is disposed about the sensor head.

5. The pressure sensing medical device of claim 1 , wherein the contact member extends outward from the sensor head.

6. The pressure sensing medical device of claim 1 , wherein the contact member is integrally formed with the sensor head from a single monolithic piece of material.

7. The pressure sensing medical device of claim 6 , wherein the contact member is formed as a step adjacent the distal end of the pressure sensor.

8. The pressure sensing medical device of claim 6 , wherein the contact member is formed as one or more protrusions.

9. The pressure sensing medical device of claim 6 , wherein the contact member is formed as an inward taper from the contact point distally toward the distal end of the pressure sensor.

10. The pressure sensing medical device of claim 9 , wherein the inward taper forms an angle with a longitudinal axis of the pressure sensor of less than about 45 degrees.

11. The pressure sensing medical device of claim 9 , wherein the inward taper forms an angle with a longitudinal axis of the pressure sensor of more than about 45 degrees.

12. The pressure sensing medical device of claim 1 , wherein the contact member is separately formed from the pressure sensor and subsequently fixedly attached thereto.

13. The pressure sensing medical device of claim 12 , wherein the contact member is formed as a tubular sleeve.

14. The pressure sensing medical device of claim 12 , wherein the contact member is formed as an annular ring.

15. The pressure sensing medical device of claim 12 , wherein the contact member is formed as one or more protrusions.

16. A pressure sensing medical device, comprising:
a guidewire including an elongate tubular member having a lumen extending therethrough, the tubular member being movable between a generally straightened position and a deflected position; and
an optical pressure sensor attached at a distal end of a fiber optic extending longitudinally within the lumen, the pressure sensor being disposed within a distal portion of the tubular member;
wherein the optical pressure sensor includes a sensor head having and a deflectable membrane coupled to a distal end region of the sensor head;
wherein the sensor head has a proximal end disposed adjacent to the distal end of the fiber optic;
wherein the pressure sensor further includes one or more contact members coupled to an outer surface of the sensor head at a position between the distal end region and the proximal end of the sensor head, the one or more contact members being capable of providing one or more distinct contact points between the one or more contact members and an inner surface of the tubular member when in the deflected position, the one or more distinct contact points being axially spaced apart from the membrane along a longitudinal axis of the pressure sensor.

17. The pressure sensing medical device of claim 16 , wherein the one or more contact members extends outward from the pressure sensor.

18. The pressure sensing medical device of claim 16 , wherein the one or more contact members is integrally formed with the pressure sensor from a single monolithic piece of material.

19. The pressure sensing medical device of claim 18 , wherein the one or more contact members is formed as an inward taper from the contact point distally toward the distal end of the pressure sensor.

20. A pressure sensing medical device, comprising:
a guidewire including an elongate tubular member having a lumen extending therethrough, the tubular member being movable between a generally straightened position and a deflected position; and
an optical pressure sensor attached at a distal end of a fiber optic extending longitudinally within the lumen, the pressure sensor being disposed within a distal portion of the tubular member;
wherein the pressure sensor includes a sensor head and a pressure-sensitive membrane disposed on a distal end of the sensor head;
wherein the sensor head has a proximal end disposed adjacent to the distal end of the fiber optic;
wherein the pressure sensor further includes one or more contact members secured to an exterior surface of the sensor head at a position between the distal end and the proximal end of the sensor head, the one or more contact members being capable of providing one or more distinct contact points between the one or more contact members and an inner surface of the tubular member when in the deflected position such that the membrane is spaced apart from the inner surface, the one or more distinct contact points being axially spaced apart from the membrane along a longitudinal axis of the pressure sensor.

Assignees

• Boston Scient Scimed Inc

Inventors

• Mcgowan Roger W
• Lee Gregory

Classifications

• A61B5/0215 Primary

  by means inserted into the body · CPC title

• G01L11/025

  using a pressure-sensitive optical fibre · CPC title

• A61B5/02154 Primary

  by optical transmission · CPC title